Plutonium
The fallout of Ivy Mike contained two new elements which were then named einsteinium and fermium.
it was discovered in London, England.
Hydrogen was discovered.
The artificial element curium (Cm).
Henry Cavendish discovered the element hydrogen in 1766.
The artificial radioactive element curium (Cm).
Hydrogen was discovered first in 1766, while promethium was discovered much later in 1945.
The lightest artificial isotope is hydrogen-3, also called "tritium". The lightest element that has no naturally occurring isotopes is technetium.
Einsteinium
einsteinium and fermium
The name of the artificial chemical element darmstadtium is derived from the name of the town Darmstadt (Germany) where this element was discovered.
Hydrogen was first discovered by Henry Cavendish in 1766.